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How does the referee measure the long jump performance in the long jump competition of the sports meeting? What is the basis for this? PS: This is a math problem! ! !
Measure the result of the longest vertical jump between two points with a ruler.

It is measured from the point closest to the high jumper, that is, from the heel. If your feet touch the ground behind your back, start with your hands, and if your hips sit on the ground and touch the ground, start with the landing point of your hips. In short, any point of the body touches the ground and the nearest point is measured.